\begin{table}
\centering
\begin{tabular}{lrrrrrrrr}
\toprule
\multicolumn{1}{c}{ } & \multicolumn{4}{c}{Firm Level} & \multicolumn{4}{c}{Firm-Politician Level} \\
\cmidrule(l{3pt}r{3pt}){2-5} \cmidrule(l{3pt}r{3pt}){6-9}
\multicolumn{1}{c}{Political Activity} & \multicolumn{2}{c}{Public Companies} & \multicolumn{2}{c}{\makecell[c]{Donations and Lobbying\\(in USD MM)}} & \multicolumn{2}{c}{Dyads} & \multicolumn{2}{c}{\makecell[c]{Donations and Lobbying\\(in USD MM)}} \\
\cmidrule(l{3pt}r{3pt}){1-1} \cmidrule(l{3pt}r{3pt}){2-3} \cmidrule(l{3pt}r{3pt}){4-5} \cmidrule(l{3pt}r{3pt}){6-7} \cmidrule(l{3pt}r{3pt}){8-9}
  & Frequency & Proportion & Money & Share & Frequency & Proportion & Money & Share\\
\midrule
\cellcolor{gray!6}{None} & \cellcolor{gray!6}{6627} & \cellcolor{gray!6}{0.68} & \cellcolor{gray!6}{0} & \cellcolor{gray!6}{0.00} & \cellcolor{gray!6}{5589331} & \cellcolor{gray!6}{0.96} & \cellcolor{gray!6}{0} & \cellcolor{gray!6}{0.00}\\
Lobbying Only & 272 & 0.03 & 271152531 & 0.09 & 219764 & 0.04 & 2296711400 & 0.80\\
\cellcolor{gray!6}{Donations Only} & \cellcolor{gray!6}{2374} & \cellcolor{gray!6}{0.24} & \cellcolor{gray!6}{32967914} & \cellcolor{gray!6}{0.01} & \cellcolor{gray!6}{23270} & \cellcolor{gray!6}{0.00} & \cellcolor{gray!6}{41926570} & \cellcolor{gray!6}{0.01}\\
Lobbying and Donations & 518 & 0.05 & 2554803346 & 0.89 & 12862 & 0.00 & 520285821 & 0.18\\
\cellcolor{gray!6}{Total} & \cellcolor{gray!6}{9791} & \cellcolor{gray!6}{1.00} & \cellcolor{gray!6}{2858923791} & \cellcolor{gray!6}{1.00} & \cellcolor{gray!6}{5845227} & \cellcolor{gray!6}{1.00} & \cellcolor{gray!6}{2858923791} & \cellcolor{gray!6}{1.00}\\
\bottomrule
\end{tabular}
\end{table}
